Lagrangian Similarity Modeling of Vertical Diffusion from a Ground-Level Source
Lagrangian Similarity Modeling of Vertical Diffusion from a Ground-Level Source
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地面源垂直扩散的拉格朗日相似模型
DOI：
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发表时间：
1979
期刊：
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通讯作者：
Thomas W. Hors
中科院分区：
文献类型：
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作者：
Thomas W. Hors
摘要利用拉格朗日相似理论计算了扩散示踪剂的侧风积分浓度，并与地面示踪剂源下风向50-3200 m处的实测数据进行了比较。理论和数据之间的一致性是好的，支持拉格朗日相似理论用于预测地面浓度的无量纲顺风距离至少为x/Z 0 =2×105的有用性。结果还表明，被动污染物的涡动扩散率与热扩散率的对应关系比与动量扩散率的对应关系更接近;在不改变污染物垂直分布形式的情况下，通过改变扩散的垂直尺度，可以更好地预测大气稳定度对地面浓度的影响。
Abstract The crosswind-integrated concentrations of a diffusing tracer were calculated from Lagrangian similarity theory and compared to field data at distances from 50–3200 m downwind of the ground-level tracer sources. The agreement between theory and data is good, supporting the usefulness of Lagrangian similarity theory for the prediction of ground-level concentrations to a dimensionless downwind distance of at least x/Z0=2×105. The comparison also demonstrates that 1) the eddy diffusivity of passive contaminants corresponds more closely to that of heat than that of momentum and 2) the effect of atmospheric stability on the ground-level concentrations may be closely predicted by altering the vertical scale of the diffusion without changing the form of the vertical distribution.